I recently got a new adapter for my dell inspiron1420 laptop as the older one had stopped working. My friend is having troubles with his adapter (it's not charging) so I let him use mine. After he gave it back, it seems that my adapter is no longer working. Nothing pops up, but when I press the battery icon it says "0% plugged in, not charging". Is there something that will make an adapter break through a computer? The fact that my friend's adapter is broken and then my adapter broke after he used it, points to his computer being the one to blame. Maybe a virus? Can I fix this?